Ruling pen



July 31, 1923. 1,463,285

- E. LAWRENZ RULING PEN Filed July 19. 1922 15mm Wm,

I is a, specification.

Patented July 31, 1923.

{@J 'I em EMIL Lnwnnnz, or nn'raorr, Minn e-AN.

3mm PEN".

1 0 all to how. it 172 ay concern.

Be it knownthat I, EMIL LAwnnNz, a citi 5 zen of the United States, and residing at Detroit, in the county of l/Vayne and State of Michigan, have invented a new and Improved Ruling Pen, of-which the following This invention relates to ruling pens designed to draw lines of indefinite length of the same'width throughout, and its object is to provide a device of this character which can readily be cleaned and sharpened, which can be readily adjusted todraw lines of any predetermined width, and which can beeasily readjusted should it get out of adj ustment. f

This invention consists of a ruling pen embodying a pair of blades,- one of them of resilient material so tensioned that the blades will normally swing apart to permit cleaning'and sharpening, one of the blades having a hole and the other an elongated slot, and a bolt and a nut thereon to press the blades toward each other, the head of the bolt being elongated to pass through the slot in one of the blades and thereafter rotatable to extend across the slot, the outer surface of the slotted'blade being notched to receive the bolt head and,-p r-event .it from turning. V f

' It also consists in forming the nut of inner and'outer parts having conical engaging surfaces to secure the rotationof the inner part by the outer'but permitting dis-- engagement to allow relative rotation between the parts of the nut.

It further consists of the drawing and particularlypointedvout in the claims.

In the drawing, Fig. 1 is a top and Fig. 2

. a bottom plan of a ruling pen embodying the present invention. Fig. 3 isa'side elevation and section on the line 3-3 of Fig.

1. F igs. 4 and 5 are sections on the line 4-4: of Fig. 1 showing the two parts of'the nut in two relative positions. p

Similar reference characters refer to like Darts throughout the several views;

WVhile the pen shown'in the drawing ls provided with a handle 1, it should be understood that the; present invention is applicable to ruling pens of every description, including those constituting permanent-.or replaceable parts of compasses and bow pens.

Each pen embodies a base 2 and two blades detailsof con-- struction' illustrated in the accompanying Application filed 5111 7119, 1-922.v Serial No.-576,0l9.

.3 and 4. rigidly connected-to the base Lone of the blades being of resilient metal. so that itmay freely bend at about the point 5 when released topcrinit the points 6 and-7? to be cleaned} and sharpened. The blade 6 is shown formed with" an elongated slot 7 to v permitthe passage of the head 8 of the bolt 7 9. and with arecess 10 .to receive-the head 8 when that is crosswise to the slotg7, as shown in Fig. 2..

The recess l0 'and1the I under side of the head 8 are preferably a rounded to permitthe bolt to swing as the pen is opened or closed. I

The-blade t is formed with a hole-12 to permit the bolt 9 to pass through and on] the; bolt is a nut formed of two parts 13 and 14:. The inner part 13, is threaded on i the bolt 8 and is conical andifits the conical bore of the outer part .14 which hasa graduated dial 15 so that the distance between the points 6 and 7 a and therefore the widths of the lines can be accurately predetermined.

The inner part 13 of the nut maybe formed with aslot 16 1 so that the nut may be adustec.

The method of adjusting this ruling pen is as follows: After the pen is cleaned and d sharpened, which can easilybe done while I theparts are in the position shown in Fig.

head 8 slips through the slot 7, after which the bolt is turned until the head is acrossthe slot 7 and rests'in the recess or' notch 10. The nut is then screwed down until the points 6 and 7 contact.

The user then observes the angular distance between 'the'line L7 on the blade 4: and.

the 0 mark on the dial 15 and then turns backthe'nut several turns. The outer nor- 7 tion leis then pressed downas shown in Fig.

5 and turned independently of the part 13 the angular distance observed when the points 6 and 7 contact. The parts are then released so the two parts of the nut again engage, as shown in Fig; 4, after which the nut may be screwed down until the points 6 and 7 engage, at which position the 0 "on the dial 15 should register with the line 17:;

It is then an easy matter toturn the nut tocol predetermine the widths of. the lines tobe drawn. 1

v The taper ofthe part 13' of the nut and.

of the recess in the partil is su'ch thatthe friction between them issutliciently greatto} turn the nut on the screw. It will be understood that the part 13Tnever touches the 95" 3, the blades are brought together until the blade 4 and hence there is no friction between them.

Another method of adjusting this pen is to turn the dialto zero position and hold it there While the central portion 13 is being turned by a tool engaging in the slot 16 until thepoints 6 and 7 engage.

The details andproportions of the parts of this pen may all be changed by those skilled in the art Without departing from the spirit of my invention as setforth in the following claims.

I claim .1; In a ruling pen, a pair of blades rigidly connected at their inner ends and having alined apertures, a bolt extendingthrough the apertures in the blade and a nut on the outer end of the bolt, said nut consisting of aninner conical part threaded on the bolt and tapering toward the adjacent blade and an outer part having a conical recess to receive the inner part and adapted to turn the same when the parts are in engagement.

2, 111 a ruling pen, a pair of blades rigidly connected at their inner ends and having alined apertures, a bolt extending through the apertures in the blade and a nut on the outer end of the bolt said not consisting of an inner conical part threaded on the bolt and tapering toward the adjacent blade and an outer part having a conical recess to receive the inner part and adapted to. turn the same when the parts are in engagement, said outer part of the nut being provided With a series or" graduations to indicate its angular movements.

EMIL LAVVR-ENZ. 

